|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Magnetics and the Critical Materials Challenge: An FMD Symposium Honoring Matthew J. Kramer
||Structure and Magnetic Properties of Galfenol Nanocomposite Alloys
||M. T. Islam, R. Nandwana, J. Healy, J. K. Jaklich, B. Dong, Matthew A. Willard, A. Yu, Y. Ijiri, E. E. Moore, S. K. McCall
|On-Site Speaker (Planned)
||Matthew A. Willard
The iron-rich alloy Galfenol (Fe1-x-Gax, 10%<x<30%) has been of significant interest for sensor technologies due to the sizeable magnetostriction coefficient found in single-crystal and polycrystalline films. [1,2] However, it is necessary to improve the magnetic softness of the material for many applications. To do so, we have explored the use of Zr and other glass formers and additives, rapid solidification approaches, and subsequent annealing to produce a nanocrystalline (Fe,Ga)-based alloy with the desired magnetostrictive and structural properties. We report studies on a series of 11 melt-spun and annealed (Fe1-x-Gax)92Zr8 alloy ribbons where the Ga concentration (0.15 ≤ x ≤ 0.36) by x-ray diffractometry, scanning electron microscopy, and magnetometry. As x exceeds 26 the formation of the ternary ZrFe6Ga6 intermetallic is observed, consistent with CALPHAD-type database calculations. Saturation magnetization, coercivity, and magnetostriction will also be reported in the context of structure-property relationships.
Acknowledgment: Prepared by LLNL under Contract DE-AC52-07NA2.